Take-up stop-motion for looms.



Patented May 8, 1900.

T. FINN & wQs. BRODIE. TAKE-UP STOP MOTION FOR LOOMS.

(Application filed July 1, 1899.)

(No Model.)

THE Norms FETKRS co.. PHDTOL|1H0..W ASH!NGYON, m1;

THOMAS FINN AND WILLIAM S. BRODIE, OF NORTH ANDOVER,

MASSACHUSETTS.

TAKE-UP STOP-MOTION FOR LOOMS.

' SPECIFICATION formingpart Of Letters Patent No. 649,203, dated May S,1900.

Application filed July 1, 1899. Serial No. 722,601- (No model.)

- T0 aZZ whom it may concern.-

Be it known that we, THOMAS FINN and WILLIAM S. BRODIE, citizens of theUnited States, and residents of North Andover, in the county of Essexand State of Massachusetts, have invented certain new and usefulImprovements in Take-Up Stop-Motions for Looms, of which the followingis a specification.

This invention relates to an improved stopmotion device for the take-upof looms which when used will prevent the take-up roll from taking upthe warps after the filling breaks,

without any filling before the lay comes to rest. The result will bethat if the take-up roll is not let back there will be a thin place onlight-weight goods.

in the fabric, which is particularly noticeable It is extremelydifficult for the weaver to let off the take-up roll just the rightamount to bring it back to the position in which it was when the loomwas knocked off, for if it is let oif too much the result will be athick place across the vstrip, and if it is not let off enough a thinplace will appear. If the take-up is not let off the right amount andthe loom is started up, it is often necessary for the weaver to pick outtwo or three weft-threads and adjust the take-up again, with theprobable result of not getting it right even then. This all consumesconsiderable time, with the chance of poor results. Certain devices havebeen designed to stop the take-up before the lay comes to rest; but sofar as we are aware these devices have not been applied to looms inwhich the knock-off stop-motion is in the middle of the lay and are notof such a nature that they may be readily applied to existing looms.

The object of our invention is to provide a simple and inexpensivedevice which may be readily applied to the ordinary loom which has thestop motion knock-off in the middle of the lay without the necessity ofchanging or adapting any of the parts thereof to accommodate it, whichwill always stop the take-up on the pick in which the filling breaks orruns out and which when used will enable the weaver to produce much moreand more perfectly woven cloth than would be possible without ourattachment.

For a more complete understanding of our invention attention is calledto the accompanying drawings, in which we have illustrated only suchparts of the old machine as necessarily cooperate with our device, andin which-'- Figure 1 is a section on the line X X of Fig. 2. showing acommon form of stop-motion knock-off in its normal position. Fig. 2 is aplan view of a portion of the loom. Fig. 3 is an end elevation showingthe parts in the knocked-off position.

In. the drawings, 1 indicates the breastbeam, and 2 the lay. 3 indicatesa" bracket, which has the inclined top or cam-arm 3. The knock-off 4 ispivoted on the shaft 5 to bracket 3. The dagger 6 is pivoted on abracket 6, carried by the lay. The weft-forks 7 are carried by the shaft7 at the front side of the lay. A link 7 is eccentrically connected tosaid shaft at one end and to the dagger, in front of the point at whichthe latter is pivoted, at the other end, so that when the forks swingdown the dagger will be lowered and when the latter is lifted as itrides up the cam-arm the forks willbe swung up. The shipper-arm 8 issecured to and extends at right angles from the shipper-rod 9, whichlatter extends from end to end of the breastbeam and is operated byhand-levers 9" at each end thereof. When the loom is running, the arm 8will be thrown up against the projection 4: on the side of the knock-0E,as shown in Fig. 1, and it will also remain in engagement withprojection 4: during the entire backward movement of the knock-01f toits abnormal position. (Shown in Fig. 3.) The take-up ratchet-wheel 10is provided with the usual driving-pawl 11 and holding-pawl12. All ofthe parts above described. are well known in the art.

J ournaled on the back side of the breastbeam is a rod R, which extendsfrom a point opposite the knock-off to the end of the breastbeam and isthen bent at right angles around the end of the breast-beam and over-thetakeup ratchet-wheehforming an arm 1. This arm 0* is connected by a wire13 tothe holding-pawl 12. A coiled spring 14, which is secured to theend of the breast-beam and to the arm 7, constantly tends to draw downthe latter. The opposite end of the rod R is provided with aslightly-curved depending 7", which engages the back side of theknockoff, it being constantly drawn into engagement therewith by thespring 14:. A friction-washer 15 is provided on the shaft 5, on whichthe knock-off is pivoted, and the nut 16, which clamps thereon, makesthe necessary friction between the knock-off and the nut or shaft. Thisfriction must be sufficient to overcome the tension of the spring 14:.

The operation is as follows: As long as the filling remains unbroken thelay swings back and forth and the dagger will be held up by thefeeler-wires, which come down on the filling as the lay moves toward thebreast-beam. When the filling breaks or runs out, the feeler-wires dropinto the notch in the lay, permitting the dagger to drop, so that itengages the end of the knock-0E andforces the same back to the positionshown in Fig. 3. As the knock-off is moved back the projection 4 thereonwill press down the shipper-arm, rotating the shipper-shaft, so as tostop the loom. As the knock-0d is moved back the back side thereof willalso force back the arm 4* of the rod R to the position shown in Fig. 3,lifting the arm 1" to the position shown in full lines in Fig. 3 fromthe dotted position indicated in the same figure. This action will liftthe holdingpawl from the position shown in dotted lines to the positionshown in fulllines in Fig. 3, so that it is wholly out of engagementwith the ratchet-wheel of the take-up. As the lay will not immediatelycome to rest, as previously explained, the driving-pawl will forceforward the ratchet-wheel 5 but as the holding-pawl is drawn out ofengagement with the ratchetwheel when the driving-pawl recedes thetension on the warp will rotate the take-up rod and its ratchet-wheelback with the drivingpawl, so that no matter how many times the workingpawl may be forced forward it will not advance the take-up roll beyondthe point at which it was at the time the filling broke. It will beunderstood that as the lay advances the driving-pawl will be rotatingthe take-up forward, so that the holding-pawl will be loose when theshipper is knocked off and may be readily lifted by the rod R. It willthus be seen that the take-u p will be stopped on the same pick as thaton which the filling breaks, as the holding-pawl will be lifted beforethe lay and also the driving-pawl reach the end of their forwardstrokes. When the knockoff is at the side of the loom, it often happensthat the filling breaks beyond the fork, so that the loom will not beknocked off until the next pick; but with the knock-off in the middlethe shipper will usually be knocked off on the same pick as that onwhich the thread breaks.

As previouslystated, the friction at the pivot of the knock-off issufficient to overcome the tension of the spring l t-that is, thetension of spring 14 is not sufficient to over come the friction at thepivot and move the knock-off unassisted. For this reason after theknock-off has been forced back by the dagger the spring will not returnthe knockoff to its normal position as the lay recedes, carrying thedagger away from the end of the knock-off; but the knock-off and rod Rwill remain in the abnormal or knocked-off position, as shown in Fig. 3,sustaining the holdin g-pawl out of engagement with the ratchetwheeluntil the loom is again started by rorating the shipper-rod. When thelever 9 is pulled back, so as to rotate the shipper-rod and throw up theshipper-arm 8, the knockoff will'be forced by the latter back to itsnormal position, and the spring 14- being no longer resisted by thefriction on the knockoff will draw down the arm 7' and rotate rod R andthrow the arm 7', so that it will remain in engagement with theknock-off as the latter is moved back to its normal position and willconstantly be held in engagement therewith. The lowering of arm r'willpermit the holding-pawl to drop down into engagement with theratchet-wheel, so that all three parts will return to the position shownin Fig. 1.

If it is desired to stop or start the loom and the shipper is thrown toaccomplish this, it will not move the rod R, which will remain in thesame position as before. The only way in which the rod will be moved andthe hold ing-pawl lifted is when the knock-off is forced back by thedagger, because there is no filling or weft-thread to sustain the fork.The lifting of the holding-pawl is not at all dependent on the positionof the shipper-rod, so that it will be immaterial whether the shipper isthrown and the loom stopped when it is knocked off or not. The wholeattachment is practically independent of the knock-01f stop-motion anddoes not in any way interfere with the action of the latter.

From the above description it will be apparent that we have provided adevice which will prevent the take-up roll from winding in the warpafter the dagger has begun to move back the knock-off, which is alsosimple and effective and may be applied to any loom having the knock-01fstop-motion in the middle and by usingwhich the production of a loom maybe considerably increased.

Having described our invention, what we claim as new, and desire tosecure by Letters Patent of the United States, is as follows:

1. In a loom, a knock-offlever, means for forcing said knock-off backwhen the filling breaks, a shipper-arm arranged to be engaged by saidknock-off, a take-up ratchet-wheel,

holding and driving pawls which are adapted to engage therewith, a rod journaled adjacent to said knock-0E having two arms, one of said armsbeing adapted to be swungby said knockoff as the latter is moved back,and the other of said arms being adapted to simultaneously lift one ofsaid pawls out of engagement with said ratchet-wheel, a spring which isadapted to force the arm first mentioned against said knock-0E at alltimes, a frictional resistance which is adjusted to prevent said springfrom moving said knock-off but which will permit said spring to holdsaid arm in engagement with said knock-off as the latter is moved to itsnormal position by the shipper-arm.

2. In a loom, a knock-off lever, a bracket to which said knock-off ispivoted, means for varying the friction between said knock-off and saidbracket, means for forcing said knock-off back when the filling breaks,a shipper-arm arranged to be engaged by said knockoff, a take-upratchet-wheel, holding and driving pawls which are adapted to engagetherewith, a rod journaled adjacent to said knockoff having an arm ateach end thereof, one of said arms being arranged in the path of motionof said knock-off and the other of said arms being connected to saidholding-pawl, a spring which is adapted to constantly force saidfirst-named arm into engagement with said knock-off, the tension of saidspring being insufficient to overcome the friction between said bracketand said knock-off and move the latter; said parts being so arrangedthat when the knock-0d is forced back, the holding-pawl will be liftedout of engagement with said ratchet-wheel and said parts will remain inthe knock-off position until the shipper-arm is moved to start the loom.

3. In a loom, a bracket, a shaft projecting therefrom, a knock-01f leverpivoted thereon, a friction-washer on said shaft,a nut for pressing saidwasher against said knock-off, means for forcing said knock-0d back whenthe filling breaks or runs out, a shipper-arm which is arranged to beengaged by said knock-0E, a take-up ratchet-wheel, driving and holdingpawls therefor, a rod journaled adjacent said knock-off having an armwhich is adapted to be swung by the knock-off as it is forced back, asecond arm extending from said rod which is connected to saidholding-pawl, a spring acting on said rod so as to hold said first namedarm constantly in engagement with said knock-off, said parts beingarranged so that upon the breaking of the weft-thread said holding-pawlwill be lifted and will not be permitted to fall into engagement withthe ratchet-wheel until the shipper-arm is thrown to start the loom.

In testimony whereof we have affixed our signatures in presence of twowitnesses.

THOMAS FINN. WILLIAM S. BRODIE.

\Vitnesses:

LoUIs H. HARRIM'AN', M. O. JA UITH.

